1) American slang (circa 1980) for the television, and serving as a bargaining tool by parents in disciplining their children, who referred to the time wasted watching it, and lowering their IQ too, hence "boob tube"

The new opiate of the people. A electronic box containing a video screen and a speaker, watched by millions of cretins too lazy to go out and get a life. Boob tube watchers get a bad case of half-closed eyes and half-open mouths.

If you watch too much boob tube, you will end up looking like Cletus the Slack-Jawed Yokel.

daughter:hey mom im going to watch the boobtube would u like to join me?
mom: no thanks sweetheart i watched a lot of the boobtube last ngith with ur father, well i didnt technically watch it *snicker*